/****************************************************************************
 *
 *   Copyright (c) 2017,2021 Eike Mansfeld ecm@gmx.de. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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package com.comino.video.src.impl.http;



import java.io.*;
import java.util.ArrayList;
import java.util.List;

import com.comino.video.src.impl.proxy.MSPVideoProxy;

/**
 * Very simple MJPEG reader
 *
 * @author Peter Abeles
 */
public class MSPVideoMjpegCodec {
	// start of image
	public static final byte SOI = (byte)0xD8;
	// end of image
	public static final byte EOI = (byte)0xD9;
	
	ByteArrayOutputStream bout = new ByteArrayOutputStream(32768);


	/**
	 * Read a single frame at a time
	 */
	public byte[] readFrame( DataInputStream in ) {
		try {
			if( in.available() > 0 ) {
				return readJpegData(in);
			}
		} catch (IOException e) {}
		return null;
	}

	private byte[] readJpegData(DataInputStream in) throws IOException {

		boolean foundFF = false;

		while( in.available() > 0 ) {
			byte d = in.readByte();
			if( foundFF ) {
				switch(d) {
				case EOI:
					return bout.toByteArray(); // Prevent new allocation
				case SOI:
					bout.reset();
					bout.write(0xFF);
					bout.write(SOI);
					break;
				default:
					bout.write(0xFF);
					bout.write(d);
					foundFF = false;
				}
			} else if( d ==(byte)0xFF ) {
				foundFF = true;
			} else {
				bout.write(d);
			}
		}
		return null;
	}


}
